On the 2 part they come in Gallon Bag mixes, That you add to a gallon Jug and Mix it up!
Then you dose the amount your tanks demand uses every day, And without a lot a SPS your demand will be very low. You may get by with just dripping Kalk at night in a container with a valve to adjust the drip so it goes very slowly into your sump. And to start I would only make small amounts of it until you get familiar with how much will drip overnight, You can adjust this by timing how much goes in say every hour and figure how much evaporation your tank uses and replace that water with Kalk. Simple but you must not overdose as the PH of Kalk is around 14 so you can really damage your tank if you over do it. Start with a gallon jug and let it drip very slow, Keep the valve an inch above the bottom of the jug and don't let the scum layer on top get in the tank, Stop it before it reaches the valve. Timing is key in how fast you drip and how much you let drip overnight.
Bill
PS, 2 tsp Mrs Wages per gallon of RODI water is the correct mix for Kalk, Mix and let it settle for at least an hour before use, Longer if possible FYI